post number 16 is cooled
post number 21 is non cooled
you see the hugr temp difference; i believe this will help me to boost more psi...



1075 is the maximum heat tolerance.


LOL ; Just once

Interesting 14 psi with the centrifugal is the same temp as roots at 8-9psi. I've run EFI IC centrifugal to 12psi on 8.75:1 on pump gas and 16-17 psi in my GMC Syclone on pump gas. But both were EFI and intercooled and not roots.

i had a thypoon long time ago; wanted syclone after selling that car but almost impossible to find one in europe...

look at my audi its 9.2 to 1 comp and i am boosting 28 psi max 25 continous.pump gas-everyday use station wagon,i go shopping with this car..

yes you are right roots is the oldest technology but esiest to install and cheapest to buy ;)

hereis my audi boost gauge;

sorry wrong pic; cant find boost gauge but np; i can take a pic tomorrow.

28 psi peak,25 continous boost....yes no misprinting

here is one i posted at audi forums